3G TS V1.0.0 ( )

Transcription

1 3G TS V1.0.0 ( ) Technical Specification 3rd Generation Partnership Project; Technical Specification Group Core Network; GPRS Tunnelling Protocol (GTP) specification for GLR (3G TS version 1.0.0) The present document has been developed within the 3 rd Generation Partnership Project ( TM ) and may be further elaborated for the purposes of. The present document has not been subject to any approval process by the Organisational Partners and shall not be implemented. This Specification is provided for future development work within only. The Organisational Partners accept no liability for any use of this Specification. Specifications and reports for implementation of the TM system should be obtained via the Organisational Partners' Publications Offices.

2 3G TS version G TS V1.0.0 ( ) Reference DTS/TSGN-0229abcU Keywords, CN Postal address support office address 650 Route des Lucioles - Sophia Antipolis Valbonne - FRANCE Tel.: Fax: Internet

3 3G TS version G TS V1.0.0 ( ) Foreword Scope Normative References Definitions and abbreviations Definitions Abbreviations General Transmission order and bit definitionsl GTP header Signalling Plane Signalling protocol Signalling Message Formats Usage of the GTP Header Path Management messages Tunnel Management messages Location Management message Mobility Management messages Reliabe delivery of signalling meesages Information element Transmission Plane Path Protocol Error handling Inter-PLMN GTP communication over the Gp Interface IP, the networking technology userd by GTP GTP parameters...9 History...9 Foreword This Technical Specification (TS) has been produced by the 3 rd Generation Partnership Project (). This TS specifies the signalling requirements and procedures used at network elements related to the Gateway Location Register (GLR) for GPRS Tunnelling Protocol (GTP) within the system. (i.e. This TS specifies the delta against TS ) The contents of the present document are subject to continuing work within the TSG and may change following formal TSG approval. Should the TSG modify the contents of this TS, it will be re-released by the TSG with an identifying change of release date and an increase in version number as follows: Version 3.y.z where: x the first digit: 1 presented to TSG for information;

4 3G TS version G TS V1.0.0 ( ) 2 presented to TSG for approval; 3 Indicates TSG approved document under change control. y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the specification; 1 Scope This Technical Specification (TS) describes the signalling requirements and procedures used at network elements related to the GLR for GTP within the system at the application level. This TS gives the description of the systems needed only in the network utilising GLR as the delta document against TS Normative References References may be made to: a) specific versions of publications (identified by date of publication, edition number, version number, etc.), in which case, subsequent revisions to the referenced document do not apply; b) all versions up to and including the identified version (identified by "up to and including" before the version identity); c) all versions subsequent to and including the identified version (identified by "onwards" following the version identity); or d) publications without mention of a specific version, in which case the latest version applies. A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the same number. [1] TS : "General Packet Radio Service (GPRS); Service description Stage2". [2] TS 23.abc: "Gateway Location Register (GLR) stage2". [3] TS : "Mobile radio interface layer 3 specification, Core Network Protocols Stage 3". [4] TS : "Mobile Application Part (MAP) specification". [5] TS : "General Packet Radio Service (GPRS); GPRS Tunnelling Protocol (GTP) across the Gn and Gp Interface". 3 Definitions and abbreviations 3.1 Definitions For the purpose of this Technical Specification, the following definitions apply. Gateway Location Register : This entity handles location management of roaming subscriber in visited network without involving HLR. Intermediate GSN: This entity is used as serving GSN towards home network and relay some PDU notification messages between serving GSN and Gateway GSN.

5 3G TS version G TS V1.0.0 ( ) MM context: MM Context ID: Path: Path Protocol: PDP: PDP Context: Signalling message: T-PDU: TID: The information sets held in MS and GSNs for a GPRS subscriber related to mobility management (MM). IMSI or equivalent for use in conjunction with Anonymous Access (please refer to section GTP Header). The UDP/IP path and TCP/IP path are examples of paths that may be used to multiplex GTP tunnels. The Path Protocol is the protocol(s) used as a bearer of GTP between GSNs. A Packet Data Protocol (PDP) is a network protocol used by an external packet data network interfacing to GPRS. The information sets held in MS and GSNs for a PDP address. GTP signalling messages are exchanged between GSN pairs in a path. The signalling messages are used to transfer GSN capability information between GSN pairs and to create, update and delete GTP tunnels. An original packet, for example an IP datagram, from a MS or a network node in an external packet data network. A T-PDU is the payload that is tunnelled in the GTP tunnel. A Tunnel ID (TID) consists of a MM Context ID and a NSAPI. 3.2 Abbreviations For the purpose of this specification, the following abbreviations apply. GLR GPRS GTP IP GLR TID UDP Gateway GPRS support node Gateway Location Register General Packet Radio Service GPRS Tunneling Protocol Intermediate GSN Internet Protocol Gateway Location Register Serving GPRS support node Tunnel Identifier User Datagram Protocol 4 General This section defines the GPRS Tunnelling Protocol (GTP) specific to the network with the GLR, i.e. the protocol between and other nodes (i.e., and GTP-MAP protocol-converting GSN). It includes only the GTP signalling but not data transfer procedures. The interface between IM_GSM and is either intra-plmn interface or inter-plmn interface.

6 3G TS version G TS V1.0.0 ( ) GLR HLR GTP-MAP Protocol Converting GSN GTP-MAP Protocol Converting GSN Signalling Interface Signalling and Data Transfer Interface Figure 1: Logical Architecture for PS domain in the network with GLR The GTP protocol is implemented only by s, s and s. No other systems need to be aware of GTP. GPRS MSs are connected to a without being aware of GTP. It is assumed that there will be a many-to-many relationship between s, s and s. A may provide service to many s. A may provide service to many s and s. 5 Transmission order and bit definitionsl Transmission order and bit definitions on the interface between the and other nodes in the network with GLR are the same as that used in the network without the GLR, see TS GTP header The GTP header used on interface between the and other nodes in the network with GLR is the same as that used in the network without the GLR, see TS Signalling Plane The only signalling plane exists between the and other nodes (i.e., and GTP-MAP protocolconverting GSN).

7 3G TS version G TS V1.0.0 ( ) GTP GTP Path Protocol Path Protocol GSN GSN Figure 2: Signalling Plane - Protocol stack 7.1 Signalling protocol Refer to the corresponding section in TS Signalling Message Formats GTP defines a set of signalling messages between two associated GSNs. The signalling messages to be used between the and other nodes are defined in the table below. For the GTP signalling messages to be used on other interfaces see TS Table 1: Signalling messages Message Signalling message Reference Type value (Decimal) 3 Version Not Supported in TS PDU Notification Request in TS PDU Notification Response in TS PDU Notification Reject Request in TS PDU Notification Reject Response in TS Send Routeing Information for GPRS Request in TS Send Routeing Information for GPRS Response in TS Failure Report Request in TS Failure Report Response in TS Usage of the GTP Header For signalling messages the GTP header used in the network with the GLR is the same as that used in the network without the GLR see TS Path Management messages The messages, which are listed in following table, are used on the interface between the and other nodes. For the definitions of these messages and other messages used on the other interfaces refer to the corrsponding sections in TS Messages Sending node Receiving node

8 3G TS version G TS V1.0.0 ( ) Version Not Supported,, 7.5 Tunnel Management messages The Tunnel Management messages are the control and management messages, defined in TS , used to create, update and delete tunnels to be able to route T-PDUs between a MS and an external packet data network via and. The GMM/SM messages that may trigger the sending of the Tunnel Management messages are defined in TS In following table, only the messages used between the and and between the and are listed. For the definitions of these messages and other messages used on the other interfaces refer to the corresponding sections in TS Messages Sending node Receiving node PDU Notification Request PDU Notification Response PDU Notification Reject PDU Notification Reject Response 7.6 Location Management message In the network with the GLR, The optional Location Management messages are defined to support the case when Network-Requested PDP Context Activation procedures are used and an does not have a SS7 MAP interface. GTP is then used to transfer signalling messages between the and a GTP-MAP protocol-converting GSN in the GPRS backbone network. The GTP-MAP protocol-converting GSN converts the signalling messages described in this section between GTP and MAP. The MAP messages are sent to and received from the GLR. The GTP-MAP protocolconverting function is described in TS The MAP protocol describing the corresponding procedures and messages is described in TS This alternative method is illustrated in Figure 3.

9 3G TS version G TS V1.0.0 ( ) GTP-MAP Interworking GTP GTP MAP TCAP MAP TCAP UDP UDP SCCP SCCP IP IP MTP3 MTP3 L2 L2 MTP2 MTP2 L1 L1 L1 L1 GSN GLR Figure 3: - GLR Signalling via a GTP-MAP protocol-converter in a GSN In following table, only the messages used between the and The GTP-MAP protocol-converting GSN are listed. For the definitions of these messages and other messages used on the other interfaces refer to the corresponding sections in TS Messages Sending node Receiving node Send Routeing Information for GPRS Request GTP-MAP protocol-converting Send Routeing Information for GPRS Response GTP-MAP protocol-converting Failure Report Request GTP-MAP protocol-converting Failure Report Response GTP-MAP protocol-converting 7.7 Mobility Management messages The messages belogning to the mobility management messages are not used on the interface between the and other nodes in the network with the GLR. 7.8 Reliabe delivery of signalling meesages For the Reliability mechanism in the, see section 7.8 in TS Information element The format of information elements in the message used on the interface between the and other nodes in the network with GLR is the same as that in the network without the GLR. See TS Transmission Plane The definition of transmission plane used in the network with the GLR is the same as that used in the network without the GLR, see in TS

10 3G TS version G TS V1.0.0 ( ) 9 Path Protocol The Path Protocol on the interface between the and other nodes in the network with the GLR is the same as that used in the network without the GLR. See TS Error handling The error handling on the interface between the and other nodes is the same as that in the network without the GLR. See TS One exception is that the doesn t have a Restart Counter because the IM_GSM stores no PDP and MM context and therefore the synchronization of the status of these with other GSNs isn t needed. 11 Inter-PLMN GTP communication over the Gp Interface Refer to the corrsponding section in TS IP, the networking technology userd by GTP Refer to the corrsponding section in TS GTP parameters The definitions and directions for use of the parameters in GTP (inc. timer values or counter values and so on) on the interface between the and other nodes is the same as that used in the network without the GLR. See TS History Document history V0.0.1 Oct 1999 The GTP protocol part is separated from MAP protocol part, and new specification related to GTP issue is generated. V0.1.0 Nov 1999 For approval by N2